Let's hope they get the date right. Monday 21 July at 8:17:40 am NZST was the date and time Apollo 11 landed on the moon (I was listening to it live on the radio at work), so 6:17:40 am for Sydney and Canberra, and the same date but earlier times for countries west to about Oman, Iran and western Kazakhstan.
If someone was on the moon, they would celebrate the exact time of the anniversary at 20:17:40 UT on 20 July 2019 and if everyone on Earth did it at the same time, we'd all be in synch but at different local time and in some cases different date, exactly as happened back in 1969.